| 700 / | HD | DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS |
| 1 | DD | GENERIC CONTROL SYSTEM, APPARATUS OR PROCESS {15} |
| 83 | | .~ Having operator control interface (e.g., control/display console) {2} |
| 84 | DD | .~.~> Keyboard |
| 85 | DD | .~.~> Positional (e.g., joystick) |